From your timeline, tap to open an individual Tweet
Tap the Bookmark icon . You will be prompted that the Tweet has been Bookmarked and will be given the option to view all of your saved Bookmarks
Alternatively, you can view your saved Bookmarks by opening the “Bookmarks” tab on your nav menu.
To remove a saved Bookmark, tap the Bookmark icon from the Tweet details on a Tweet within your Bookmarks timeline. You can also tap the more icon at the top of your Bookmarks timeline to remove all of your Bookmarks at once.